Equivalent & Substitute Parts for S2B-LTP General Purpose Rectifier Diode

Part Overview

The S2B-LTP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 100V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute components is necessary for ongoing production support, maintenance applications, and design continuity where this diode was previously specified.

The S2B-LTP operates across a junction temperature range of -55°C to 150°C and complies with RoHS3 and REACH regulations. Standard recovery characteristics (>500ns) and a maximum forward voltage of 1.15V @ 2A define its electrical performance profile.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15	V @ 2 A
Speed	Standard Recovery >500ns	-
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	20	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution of the S2B-LTP is determined by the following critical parameters:

Voltage Rating (Vr): All substitute parts must maintain 100V DC reverse voltage rating to ensure circuit protection and reliability.
Current Rating (Io): The S2B-LTP is rated for 2A average rectified current. Substitute parts with equal or higher current ratings (≥2A) are considered direct equivalents. Parts with lower current ratings (1.5A) are functional substitutes only where circuit current demands do not exceed the substitute's rating.
Package Type: All identified substitutes use DO-214AA (SMB) surface mount packaging, ensuring mechanical and thermal compatibility with existing PCB layouts.
Forward Voltage (Vf): Forward voltage characteristics affect power dissipation and circuit performance. Substitutes with Vf ≤1.3V @ rated current are acceptable within standard design margins.
Recovery Speed: Both standard recovery (>500ns) and fast recovery (≤500ns) types are functionally compatible, though fast recovery types offer improved switching characteristics.
Operating Temperature Range: All substitutes support the -55°C to 150°C junction temperature range, ensuring thermal compatibility.
Regulatory Compliance: RoHS3 and REACH compliance status ensures environmental and regulatory alignment.

Parameter Comparison

Parameter	S2B-LTP (Main)	RS2B-E3/5BT	S2B-M3/52T	S2B (Diotec)
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Diotec Semiconductor
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	2 A	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	1.3 V @ 1.5 A	1.15 V @ 1.5 A	1.15 V @ 2 A
Speed	Standard Recovery >500ns	Fast Recovery ≤500ns	Standard Recovery >500ns	Standard Recovery >500ns
Reverse Recovery Time (trr)	Not specified	150 ns	2 µs	1.5 µs
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	1 µA @ 100 V	5 µA @ 100 V
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	Not specified
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-50 to 150 °C
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable

Engineering Selection Recommendations

Direct Equivalent (Preferred for 2A Applications):

The S2B (Diotec Semiconductor) is the primary direct equivalent to the S2B-LTP. It maintains identical voltage rating (100V), current rating (2A), forward voltage (1.15V @ 2A), and recovery speed characteristics. Both parts are housed in DO-214AA (SMB) packages with matching thermal and mechanical properties. The Diotec S2B is currently in active production status, ensuring long-term availability. Operating temperature range is -50°C to 150°C, which covers the S2B-LTP's specified range with a 5°C lower minimum. This part is suitable for direct PCB substitution without circuit redesign.

Functional Substitute (Current-Limited Applications):

The S2B-M3/52T (Vishay General Semiconductor) is a functional substitute where circuit current demands do not exceed 1.5A. This part shares the 100V voltage rating, DO-214AA package, and standard recovery speed with the S2B-LTP. Forward voltage is identical at 1.15V, and reverse leakage is superior at 1µA versus 5µA. The S2B-M3/52T is in active production with full RoHS3 compliance. Use this substitute only in applications where the 2A rating of the S2B-LTP is not fully utilized.

Alternative Substitute (Fast Recovery Applications):

The RS2B-E3/5BT (Vishay General Semiconductor) is a functional substitute for applications requiring fast recovery characteristics (150ns trr). This part maintains the 100V voltage rating and DO-214AA package but is rated for 1.5A average rectified current. Forward voltage is 1.3V @ 1.5A, representing a 0.15V increase compared to the S2B-LTP. The RS2B-E3/5BT is in active production with RoHS3 compliance and MSL Level 1 moisture sensitivity rating. This substitute is appropriate only where circuit current does not exceed 1.5A and fast recovery switching is beneficial.

Regulatory and Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original S2B-LTP. The Diotec S2B does not carry explicit RoHS certification but is not subject to RoHS requirements based on vendor classification. For applications requiring documented RoHS3 compliance, the Vishay parts (RS2B-E3/5BT and S2B-M3/52T) provide explicit certification.

Frequently Asked Questions (FAQ)

Q: Can the RS2B-E3/5BT replace the S2B-LTP in all applications?

A: The RS2B-E3/5BT is a functional substitute only where circuit average rectified current does not exceed 1.5A. The S2B-LTP is rated for 2A; therefore, the RS2B-E3/5BT cannot be used in applications requiring the full 2A current capacity. Additionally, the RS2B-E3/5BT has a higher forward voltage (1.3V vs. 1.15V), which increases power dissipation by approximately 13% at rated current.

Q: What is the difference between standard recovery and fast recovery diodes?

A: Recovery speed refers to the time required for a diode to transition from conducting to blocking state. The S2B-LTP has standard recovery (>500ns), while the RS2B-E3/5BT has fast recovery (≤500ns, 150ns typical). Fast recovery diodes reduce switching losses in high-frequency applications but are not necessary for low-frequency rectification. Both types are electrically compatible in the same circuit if current ratings are observed.

Q: Is the S2B (Diotec) a direct replacement for the S2B-LTP?

A: Yes. The Diotec S2B is a direct replacement. Both parts have identical voltage rating (100V), current rating (2A), forward voltage (1.15V @ 2A), recovery speed (standard >500ns), and package type (DO-214AA). The operating temperature range of the Diotec part (-50°C to 150°C) encompasses the S2B-LTP range. No circuit modifications are required.

Q: Why is the S2B-LTP marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. However, it remains available for existing applications and maintenance. The recommended substitutes (particularly the Diotec S2B) are active production parts suitable for both new designs and legacy support.

Q: Can I use the S2B-M3/52T in a 2A application?

A: No. The S2B-M3/52T is rated for 1.5A average rectified current. Using it in a 2A application exceeds its current rating and will cause excessive heat generation, reduced reliability, and potential component failure. Use only in applications where circuit current does not exceed 1.5A.

Q: Are all substitute parts available in the same packaging?

A: Yes. All identified substitutes use DO-214AA (SMB) surface mount packaging, ensuring mechanical compatibility with existing PCB layouts. No package conversion or rework is required.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects circuit performance in high-impedance applications and standby power consumption. The S2B-M3/52T has lower reverse leakage (1µA vs. 5µA), which may be beneficial in battery-powered or low-power applications. For standard rectification applications, this difference is typically negligible.

Q: Which substitute should I choose for a new design?

A: For new designs, use the S2B (Diotec Semiconductor). It is a direct equivalent with active production status, full parameter compatibility, and long-term availability assurance. This eliminates the need for circuit redesign and ensures consistency with the original S2B-LTP specifications.

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